The kernel may sleep with holding a spinlock. The function call path (from bottom to top) in Linux-4.16.7 is:
[FUNC] vfree --> can sleep kernel/kcov.c, 237: vfree in kcov_put kernel/kcov.c, 396: kcov_put in kcov_ioctl_locked kernel/kcov.c, 410: kcov_ioctl_locked in kcov_ioctl kernel/kcov.c, 409: spin_lock in kcov_ioctl This bug is found by my static analysis tool (DSAC-2) and checked by my code review. I do not know how to correctly fix this bug, so I just report them. Best wishes, Jia-Ju Bai
